/**
 ******************************************************************************
 * @file    usb_mem.c
 * @author  MCD Application Team
 * @version V4.0.0
 * @date    28-August-2012
 * @brief   Utility functions for memory transfers to/from PMA
 ******************************************************************************
 * @attention
 *
 * <h2><center>&copy; COPYRIGHT 2012 STMicroelectronics</center></h2>
 *
 * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
 * You may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *        http://www.st.com/software_license_agreement_liberty_v2
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 ******************************************************************************
 */

/* Includes ------------------------------------------------------------------*/
#include "usb_lib.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Extern variables ----------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

/*******************************************************************************
 * Function Name  : UserToPMABufferCopy
 * Description    : Copy a buffer from user memory area to packet memory area (PMA)
 * Input          : - pbUsrBuf: pointer to user memory area.
 *                  - wPMABufAddr: address into PMA.
 *                  - wNBytes: no. of bytes to be copied.
 * Output         : None.
 * Return         : None	.
 *******************************************************************************/
void UserToPMABufferCopy(uint8_t *pbUsrBuf, uint16_t wPMABufAddr,
    uint16_t wNBytes)
{
    uint32_t n = (wNBytes + 1) >> 1; /* n = (wNBytes + 1) / 2 */
    uint32_t i, temp1, temp2;
    uint16_t *pdwVal;
    pdwVal = (uint16_t *) (wPMABufAddr * 2 + PMAAddr);
    for(i = n; i != 0; i--) {
        temp1 = (uint16_t) *pbUsrBuf;
        pbUsrBuf++;
        temp2 = temp1 | (uint16_t) *pbUsrBuf << 8;
        *pdwVal++ = temp2;
        pdwVal++;
        pbUsrBuf++;
    }
}

/*******************************************************************************
 * Function Name  : PMAToUserBufferCopy
 * Description    : Copy a buffer from user memory area to packet memory area (PMA)
 * Input          : - pbUsrBuf    = pointer to user memory area.
 *                  - wPMABufAddr = address into PMA.
 *                  - wNBytes     = no. of bytes to be copied.
 * Output         : None.
 * Return         : None.
 *******************************************************************************/
void PMAToUserBufferCopy(uint8_t *pbUsrBuf, uint16_t wPMABufAddr,
    uint16_t wNBytes)
{
    uint32_t n = (wNBytes + 1) >> 1;/* /2*/
    uint32_t i;
    uint32_t *pdwVal;
    pdwVal = (uint32_t *) (wPMABufAddr * 2 + PMAAddr);
    for(i = n; i != 0; i--) {
        *(uint16_t*) pbUsrBuf++ = *pdwVal++;
        pbUsrBuf++;
    }
}

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
